Relay



1,475,498 F. A. LuNDQuls-r RELAY Nov. 27 1923k Original Filed July 13 1918 Patented Nov. 27, 1923.

UNITED 1STATES PATENT OFFICE.

FRANK A. IZITJ'NIJQUIS'I,` OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS,

- TO HENRY S. CONRAD, TRUSTEE.

RELAY.

Application filed July 13, 1918, Serial No. 244,731. Renewed May 19, 1923.v

To all whom it may concern.'

Be it known that L'FRANK A. LUND- QUIsT, al citizen of the United States ot America, and a resident ot Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Relays, of which the following is a specification.

My invention relates to relays to be Vused in automatic telephone exchanges, and has for its object improvements in such devices.

In automatic telephone exchanges each subscriber has an individual switch at the central oiiice and two wires extending Yfrom his sub-station to his switch.- At his switch and bridged between the wires `from the sub-V station to the switch, are two relays known as line relays. `One of these relays is a fast rela-y which responds to impulses at the rate of seventy or more per second.,`

while the other is a slow relay `which will not respond to impulsesas rapidas about forty per second but will respond to impulses considerably slower. fThese relays are highfwound and expensive, and there is a pair ol. .them associated with each switch in the exchange. The object here is to make one relay which will perform: all of the functions ofboth fast `and slow relays.

In the accompanying drawings* Fig. 1 is an elevation of the relay together with such circuits :as are necessary to an understanding of the operation;

Fig-.2 is a plan ;V 4

Fig. 3 is an enlarged central n section through' the valve casing; and y Fig. 4 is a section on line 4-4 ot Fig. 3.

At 11 on pole piece 12 of coil 18 is pivoted an armature 14. The armature 14 is comparatively heavy and has an arm 15 with insulation 16 on its end. Adjacent vto this insulation are contact springs 17 and 18 which are closed when'the coil 13 attracts'its armature 14. n

Supported at a convenient point is an air valve casing 19 which is provided with an inlet pipe 20, an outlet pipe 21, and vent openings 22. Inside of the casing 19 are valves 23 and 24 which have pins 25 and 26 which cont-act with each other in the reduced channel 27 which connects the valve chambers with the outlet 21.

Air pressure in pipe 20 normally holds the valves in the position shown in Fig. 8. The valve 23 has a pin 28 which extends through the end of the casing and engages the armature 14 to hold it in its retracted position.` A spring 29 acts toV pull the armature 14 toward its attractedposition and against the push of the pin 28. The tension of the spring 29 is such that its pull on the armay ture is less than the push of the pin 28, and consequent-ly the armature is normally held in its retracted position. But when a current flows through the coil 13, the magnetic pull on vthe armature 14, plusthe pull of the spring' `29, is enough to overcome thev air pressure bach of valve 24, with the result thatthevalves are shifted to connect piper 2O with pipe 21, and cut oit the connection to the exhausty vents 22. flowing to pipe 21 is conveyed to other apparatus where it performs functions not directly connectedv with the present invention.

Pivoted to the other end .of the pole piece 12 `is another armature 30, which has insulation 31 on its tail piece bearing against a spring 32. The spring 32 normally holds the armature 30 in its retracted position, but when` a current flows through .the fcoil 13 the armature 30 is attracted and moves spring 32 away from and out of electrical connection with spring 33.

Associated with the relay is'a 'battery X and a resistance It. The lines A and'B are the wires which extend from the subscribers local station to the central ofi-ice. Then the subscriber operates his calling device to make electrical connections between wires A and B, a current Hows from battery X through the coil 13 and vover 'wires A and B, and then through resistance R back `to 'the battery X. y

The result or" this current through the coil is that armatures 14 and 30 are attracted. If t-he connection between A and B is broken and remade rapidly, as is the case in the ordinary calling device for automatic telephone exchanges, then `the :armature 30 will respond as does the armature of a fast relay,'f but the armature 14 will act as the armature of a slow relay and not respond. In other words, this relay is a. fast relay as far as armature 30 is concerned, and a slow relay ras :tar as armature 14'is concerned.

The reason why the armature 14 is slow to respond is due to the :tact that the air pressure push on pin 28 is but slightly more than the attraction of spring 29, and the weight to be moved is comparatively heavy.

The compressed airv llO In the brief interval during which the circuit is broken through coil 13, this torce cannot move the armature 14- suliiciently to open the connections between springs 17 and 1S. As t'ar as observation goes, the armature let appears to stand absolutely stationary while armature 30 responds fully t-o the ordinary impulses sent in operating the calling device of an automatic exchange.

From springs 17 and 18, and 32 and 33, I have shown circuits in dotted lines to other apparatus which may be consieered as an arbitrary representation of the next switch in the series through which a call goes. ln its operation the relay closes and holds the circuit through the springs 1T and 18, and at the same time sends a series of impulses over the circuit through springs and What l claim is:

l. The combination with a coil, and Atwo armatures therefor, of an air valve operated by one ot said armatures, and means involving the action of the air valve by which the armature associated therewith will remain attracted during electrical impulses which will cause the other armature to vibrate.

2. The combination with a magnetici coil and an armature therefor, of an air pressure device act-ing' to move the armature to its retracted position, and a` spring acting to move it to its attracted position, the torce et' the air pressure device being greater than that of the spring but less than that ot the spring plus the magnetic. pull of the coil.

In combination, a pipe for conveying compressed air, a check valve normally in terrupting the flow of air thru the pipe, and a power device arranged to operate by quick successive movements each one el which is of a valve opening character and said device being also arranged to have such series of movements interrupted at any point, said valve being closed by the pressure o't the a'r in the pipe and said valve being loaded so that its closing movement will be too sluggish to permit ay closing ot the valve in the intervals between the quick movements olE the power device.

4. The con'ibination with an air pipe, and an electro-magnet having` :in armature, ot' means by which upon rapid impulses flowing thru said magnet air will continue to flow thru said pipe, and a pause in such impulses will cause a stoppage ot air tlow in said pipe.

5. In a relay, a magnetic coil, two armatures therefor, an air valve and a pair ot' springs operated by said armature?, means for rapidly operating one et said arnnitures to cause the operation ol said springs, and means cooi:erating` with said air 'valve to hold the other et said armatures in operated position duringv the rapid operation ot said first mentioned armature whereby said air valve is maintained in operated position.

6. In a relay, a magnetic coil, a 'tast and a slow armature therefor, an airl valve oper-- ated by said slow armature, a pair ot springs operated by said fas', armature, meansl 'lier vibrating said 'tast arngiature and additional means cmnlierating with said air valve to hold said slow armature in operH ated position during the vil ations et said tast armature.

7. In a relay, a magnetic coil having two armatures, a pair et contact springs operated by one ot said armatures, an air valve operated by the other ot said armatures, means 4tor sending electrical impulses through said coil, said first armature vibrating in response to said impulses to operate said contact springs in accordance with said impulses, and means cooperating with said air valve to cause said other armature to be held in operated position while said impulses are sent through said coil.

8. The combination of a coil having an armature and a spring for .making` the operation ot the armature fast in one direction, with an air valve in which the air pressure cooperates with the spring to make the armature slow acting in the other direction.

9. A magnet having an armature, a spring tending to hold the armature in attracted position, an air valve a pressure of which normally overcomes the tension oi. said spring to hold said armature in retracted position, means tor energizinfr said magnet, the magnetism in said magnet overcoming the pressure o'li said air valve and assisting said spring to m ve the armature to atA tracted position.

l0. rllhe combination with a coil havini-j an armature, oli means including a. spring and an air valve whereliy air pi" ire acting on said valve. controls the po.. ion oi` thev armature, and said spring and magnetism acting on said armature controls the position of said valve.

FRANK A. LUNJDQUIST.

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